Fuse receptacle for coal drills



Feb. 21, 1933. R K JEFFREY 1,898,129

FUSE RECEPTACLE FOR COAL DRILLS Filed. March 1931 /N VEN TOR 152 9. I Robe/"f K. Jeff/"ey- Patented Feb. 21, 1933 UNITED STATES PATENT OFFICE ROBERT K. JEFFREY, 0F COLUMBUS, OHIO, ASSIGNOR TO THE JEFFREY MANUFACTUR- ING- COMPANY, OF COLUMBUS, OHIO, A CORPORATION OF OHIO FUSE RECEPTACLE Application filed March 4,

This invention relates to new and useful improvements in fuse receptacles particularly adapted for use in conjunction with permissible mining machinery, such as coal drills, and the like.

An-important object of the invention is to provide for mounting the fuse receptacle in conjunction with the permissible chamber so as to be most accessible, and to provide closure means cooperating with ejecting means to retain the fuse in a well-established electrical connection with its conductors; the ejecting means also serving in the capacity of an ejector for the fuse upon removal of the, closure means.

Another object of the invention is to include in the fuse assembly, a part of non-conductive material, carrying the terminal connector which is provided with means for detachably connecting a fuse thereto, whereby when the fuse assembly is projected to an ejected position upon removal of the closure means, an operative can safely handle the fuse carrying part without danger of severe electrical shocks in making fuse replacements.

Still another object of the invention is to provide a device of this character having a pair of terminal connectors for detachably retaining a fuse in proper cooperative relation with the circuit in which it is adapted to be included, one of said connectors being permanently connected to its conductor and associated with the receptacle in a manner permitting of its withdrawal from the receptacle with the fuse attached thereto, without necessitating disconnection of the connector and its respective conductor.

A further object of the invention is to provide a fuse receptacle adapted to be spaced from the bottom of a permissible flame-proof electric controller chamber, so that water of condensation is precluded from fouling or grounding the fuse supported therein.

Other objects and advantages of the invention will become apparent during the course of the following description.

In the accompanying drawing forming part of the description, and wherein like num- FOR COAL DRILLS '1931. Serial No. 520,143.

erals are employed to designate like parts throughout the several views,

Figure l is a side elevation of a permissible coal drill, with a portion of its controller casing broken away to show the general location of the present improvements with respect to a coal drill, and

Figure 2 is an enlarged sectional view of the controller casing illustrating the position of the improved fuse receptacle in the controller casing.

Referring now to the drawing for a more detailed description of the invention and its various parts, the numeral 3 designates a coal drill in its entirety, having the usual longitudinally extending drive shaft 4; mounted in suitable bearings and driven from suitable gearing by an electric motor 5. A controller casing 6, forming a permissible fiameproof chamber 7 with one end wall of the drill, is bolted thereto in any suitable manner and forms an enclosure for a controller or switch, indicated in its entirety by the numeral 8. As these parts of the device are well-known in the art, a further description thereof is unnecessary, except, possibly, to mention the actuator 9 of the controller, which is mounted in the permissible casing 6, as shown.

The bottom of the chamber 7 is provided with an interiorly threaded boss 10 to receive a safety drain plug 11 having substantially square threads to cooperate with siniilarly formed threads of the boss in forming therewith sufficient clearance for the egress of water of condensation which might tend to accumulate within the permissible chamber. The clearance between these threads also serves as a flame choke and is only suflicient to permit liquid drainage while preventing the ingress of explosive gases which might be present in the mine in which the apparatus is used, so as to obviate the danger of explosions by reason of explosive gases creeping into the chamber where sparking or arcing is apt to occur.

The end wall 12 of the coal drill, to which the casing 6 is bolted, is equipped with a threaded recess 13 spaced from the bottom of the chamber 7, as shown, to receive and support the threaded open end 14 of a fuse receptacle 15 of non-conductive material. In

15 which is, of course, circular in cross section or substantially so." Removably mounted in this or closure means 1? having suitably formed apertured tool engaging wings 18 to facilitate rotation of the plug into and out of its aperture. This closure cap 17. is provided with a tubular threaded stud portion 19 adapted to be snugly engaged in the threaded aperture 16 and to freely receiveano support one end of the fuse receptacle, as clearly shown in the drawing.

A fuse assembly, indicated in its entirety by the num ral 20, is detachably mounted in the fuse receptacle 15 to facilitate replacement of a fuse F or the cleaning and replacement of the other parts of the assembly when necessary. This fuse'assembly may be said to consist broadly of a pair of separable terminal connectors 21 and 22 between which a fuse F is detachably mounted. These connectors may be either permanently or de tachably connected to conductor wires 23 and 24, respectively, leading to the controller and motor. The contact'between the connector 22 and the fuse is a firm pressural one caused by an expansion coil spring 25 located in the fusereceptacle to bear one end on the bottomof the threaded recess 13 and at its opposite end against a part 26 of non-conductive material connected to the terminal connector 22 in any suitable manner. Lon-.

gitudinal movements ofconnector 22 are permitted due to the provision of the inner end of receptacle 15 with a longitudinal slot 27 through which conductor 24 is passed.

The other unit of the fuse assembly, which includes the terminal connector 21. also includes a part 28 of non-conductive material secured to the connector and normallyproclips 29 having their free ends adapted to engage over the shouldered metallic end of the fuse F for detachably connecting the same to the connector. The end of the fuse receptacle 15 adjacent the opening 16 is also equipped with anelongated slot 30 extend ing longitudinally of the tube 15 from its opening is a screw threaded plug engage a fuse introduced therein.

outer end to a point adjacent its intermedi-- ate portion for the passage of the slacked conductor wire 23 connected to the connector 21. This construction is provided in order to permit the slack portion of the conductor wire 23 to follow the connector 21' and attached :fuse when the closure cap 17 is removed and the spring 25 urges theentire fuse assembly longitudinally of the tube to project the non-conductive part 28 through the threaded opening 16 to a point where an operative can readily grasp the same and withdraw the connector 21 with the attached fuse entirely-from the fuse receptacle and permissible casing 6 for replacement, the enlargement of the threaded opening 16. and slot 30 permitting the electrical conductor 23 being pulled out through the opening 16 to a point where the fuse will be accessible for repairs or replacement. The other unit having the 1 connector 22 will, of course remain in the inner end of the tube in position to properly Since the fuse is detachably connected to theconnector 21 by the spring jaws 29,'it can be c readily disconnected therefromrand a new fuse slipped therebetweeu when the unit is entirely removed from the tube. The jaws 29 hold the fuse F in longitudinal alignment with the unit and consequently the assembly 1 can be readily slid back into the tube 15 into operative position. The walls of the slots 27 and 30 of course, will cooperate with the wires 23 and 24 to prevent rotation of the connectors 21 and 22 when in the tube; Whfle I the slots are shown in the top of the fuse tube 15, it is obv ous that they can be positioned in the sides or bottom thereof, although it is, of course. preferable to dispose them where c is L" came a iv oncensa io he is he l f po sibil t of c l t n EiO fuse. and at the same time a similar contact will be established between the fuse and connector 21 by reason of the fact that the end of the non-conductive part 28 will be forced into engagement with the closure cap 17 by the action of the spring 25. Upon removal of this cap the spring will be exercised to release its stored energy to eject the fuse, as heretofore explained.

It is to be understood that various changes in the construction and arrange sent of parts may be resorted to without departing from i the scope of the appended claims.

I claim y 1. A fuse mounting comprising a non-conductive receptacle, a fuse slidably mounted therein, and a pair of-terminal connectors movably mounted in the receptacle and normally pressed into engagement with opposite ends of the fuse.

2. A fuse mounting comprising a non-conductive receptacle, a fuse slidably mounted therein, a pair of terminal connectors movably mounted in the receptacle and engaging opposite ends of the fuse, means for moving said connectors and fuse to a position of release, and means restraining the release of said connectors and fuse.

3. A fuse mounting comprising a non-conductive receptacle, a fuse slidably mounted therein, a pair of terminal connectors slidably mounted in said receptacle, means normally urging said connectors and fuse toward one end of the receptacle, and means for limiting said movement of the connectors and fuse.

4. A fuse mounting comprising a non-conductive receptacle, a fuse slidably mounted therein, a pair of terminal connectors movably mounted in the receptacle and engaging opposite ends of the fuse, and one of said connectors having means for detachably connecting said fuse thereto.

5. A fuse mounting comprising a non-conductive receptacle having a longitudinally extending slot, a fuse slidably mounted in said receptacle, a pair of terminal connectors slidable in the receptacle and normally urged toward one end thereof, and a conductor connected to one of said connectors and slidable in said slot.

6. A fuse mounting comprising a non-conductive receptacle having a slot extending longitudinally from one end thereof, a closure cap removably associated with said end of the receptacle, a fuse slidably mounted therein, a pair of terminal connectors slidable in the receptacle and normally urged toward said closure cap, and av conductor connected to one of said connectors and slidable in said slot.

7. A fuse mounting comprising a non-conductive receptacle, a fuse slidably mounted therein, a pair of terminal connectors slidably mounted in said receptacle and engaging said fuse, means normally urging said connectors and fuse toward one end of the receptacle, means for limiting said movement of the connectors and fuse, and means for insulating said fuse from both of aforesaid means.

8. A fuse mounting comprising a non-conductive receptacle, aclosure cap therefor, a fuse slidably mounted in said receptacle, a pair of terminal connectors slidably mounted in the receptacle and adapted to engage opposite ends of said fuse, a spring in said receptacle, a non-conductor slidably mounted between one of said connectors and the spring, and a second non-conductor arranged between said cap and other connector.

9. In apparatus of the class described, said apparatus comprising a flame-proof chamber having opposed walls, a non-conductive tube supported by one of said walls and projecting toward the other of said walls, said other of said walls being provided with an opening concentric with the tube and having a diameter greater than that of the tube, the free end of the tubehaving a longitudinal slot therein, a fuse cartridge in said tube and removable through the free end of the tube, a slack conductor in connection with said cartridge through said slot, and closure means for said opening.

10. In apparatus of the class described, said apparatus comprising a flame-proof chamber having opposed walls, a non-conductive tube supported by one of said walls, and projecting toward the other of said walls, said other of said walls being provided with an opening opposite the free end of the tube, a fuse cartridge in said tube, the tube having wall apertures at the ends of the cartridge, conductors passed through said apertures from the chamber to the cartridge, and closure means for said opening.

11. In apparatus of the class described, said apparatus comprising a flame-proof chamber having opposed walls, a non-conductive tube supported by one of said Walls, and projecting toward the other of said walls,

said other of said walls being provided with an opening opposite the free end of the tube, a fuse cartridge in said tube, the tube having wall apertures at the ends of the cartridge, conductors passed through said apertures from the chamber to the cartridge, said apertures being longitudinally elongated to permit longitudinal movements of the cartridge in the tube, and closure means for said opening.

12. In apparatus of the class described, said apparatus comprising a flame-proof chamber having opposed walls, a non-conductive tube supported by one of said walls, and projecting toward the other of said walls. said other of said walls being provided with an opening opposite the free end of the tube, a fuse cartridge in said tube, the tube having wall apertures at the ends of the cartridge, conductors passed through said apertures from the chamber to the cartridge, said apertures longitudinally elongated to permit longitudinal movements of the cartridge in the tube, closure means for said opening, and spring means in the tube urging the cartridge toward said closure means.

In testimony whereof I have hereunto set my hand.

ROBERT K. JEFFREY. 

